[Event "World Championship"] [Site "?"] [Round "0"] [White "Karpov"] [Black "Korchnoi"] [Result "1-0"] [ECO "C70"] [Opening "Spanish: 4.Ba4"] 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 { The Open Variation has always been one of Korchnoi's favorite defenses.} 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2 {White wants to eliminate Black's strong knight on e4 and is willing to let Black trade off his Bb3 by ...Nc5 and ... Nxb3.} 9... Nc5 10. c3 g6 {Black hopes to attack the pawn at e5, but this plan loses time and creates weaknesses at h6 and f6 which Black doesn't have time to defend.} 11. Qe2 Bg7 12. Nd4 {White begins his attack before Black can castle. He is willing to give up his pawn on e5 to open the e-file onto Black's king.} 12... Nxe5 {12...Nxd4 13.cxd4 Nxb3 14.Nxb3 White has a clear advantage due to his lock on c5 and Black's bad bishop on e6.} 13. f4 { Now White will use his f-pawn to open more lines onto Black's king.} 13... Nc4 14. f5 {The thematic breakthrough.} 14... gxf5 15. Nxf5 Rg8 { 15...O-O 16.Nxg7 Kxg7 17.Qh5} 16. Nxc4 dxc4 17. Bc2 Nd3 { Black hopes to defend by shutting the Bc2 out of the game.} 18. Bh6 {White prep ares to beak in on the f-file by trading off Black's last defensive piece on the kingside.} 18... Bf8 19. Rad1 Qd5 20. Bxd3 cxd3 21. Rxd3 Qc6 {White dominat es the center and his pieces are much more active. Black is close to defeat.} 22. Bxf8 Qb6+ 23. Kh1 Kxf8 24. Qf3 Re8 25. Nh6 Rg7 26. Rd7 Rb8 { It's mate after 26...Bxd7 27.Qxf7+ Rxf7 28.Rxf7+} 27. Nxf7 Bxd7 28. Nd8+ { Black resigned, since he will be mated in a few moves. If you have trouble finding the mate, I'll show you.} 28... Ke7 29. Qf8# 1-0